Filter



Sept. 3, 1935.

V. C. NORQUIST FILTER Filed Feb. 7, 1934' Patented Sept. 3, 1935 I i v 2313,3634

UNITED STATESTPAT T F I i I FILTER Victor C. Norquist, Kansas City,'Mo.,. assignor to -Butler Manufacturing Company, Kansas City,

Mo., a corporation of Missouri Application February 7, 1934, Serial No. 710.08g! 2cm. '(Cl. 210-182) My invention relates to filters and more parwith a manifold I through nipples 8, the filtrate ticularly to a filter having incorporated therein passing out of the filter through the-manifold means for cleaning the same of sludge and mat- I. A filter bottom 9 isprovided with openings ter filtered out. V Ill and H. allowing communication with a trough 5 In multileaved filters in which a plurality of I! which extends to one side of the filter. as can 5 hollow filtering elements are housed within a readily be seen byreference to Figures 1, and 2. easing into which the liquid to be filtered-is in- Through a suitable stufiing box It is positioned troduced, the problern' of cleaning the filters is an operating shaft I 5, carrying a conveyor screw acute. At present the method is to remove the i6. 'The outer .edge of the operating shaft l5 l0 filter cover; then the filter screens are removed carries a crank II. A branch duct I8 communil0 and separately cleaned. The bottom of the filter cates with the trough l 2 and has its outer end is then flushed out or a pan is provided in which closed by cover plate l9 secured thereto in any sludge may collect. These methods are time suitable manner such as shown in Figure, 2,nameconsuming and 'tediousl' In the dry cleaning ly a strong-back 20 adapted to hold the cover I9 industry and in other industries, the matter filagainst its seat by the action of screw wheel 2|. 15 tered out is often offensive, rendering the task The opposite end of the shaft l5 whichcarries of cleaning filters an unpleasant one. the screw conveyor I6 is mounted to rotate in One object of my invention is to provide a filter a suitable bearing 22, as can readily be seen by in which means for cleaning it of sludge andmatreference to Figure 3. Near the bearing 22, the ter filtered out is incorporated in the llter strucshalt carries an eccentric 23 which maybe formed 20 ture, per se. integral with the 'shaft L5 or may be connected Another object of my invention is to provide t eto- Below the bearing 22 is p o a a novel and efficient means of cleaning fllter other bearing 2l-for the shaft 25 which carries Other and further objects of my invention will 7 l k 26. e link 25 may be s cu ed to the shaft '25 appear from the following description. 25 or may be loosely mounted thereon. being 26 In the accompanying drawing which forms held in position by means of -rut 21. A slot 28 part of the instant specification and is to be read s formed in h intermediate Portion of link 25 in conjunction therewith and in which like referd is adapted to he Positihhed DQ eccehtrie ence numerals are used to indicate like parts in AhOVe hearing 32 is a third hearingv 29 about 30 the various views; which pawl 30 is adapted to rotate. The upper 30 Figure 1 is an elevational-view partly in secend of link 26 carries pivotally secured thereto tion, showing a filter equipped with one form of pawl 3|. The link 26 also carries thrust lug 32,

carrying out my invention. against whichspring 33' is adapted to seat. The

Figure 2 is a sectional view taken on a line 2-2 pp r end of pr n 33 contacts p wl 3| an urges 35 of Figure l. it against the toothed periphery 33 of wheel 35 85 Figure 3 is an enlarged detail view of the eleva-- which is P e with a s 5. T e arms 36 tlon shown in Figure 1. meet at hub 31 of the wheel 35. A stud bolt 38 Figure 4 is a sectional view taken on a line is d p o f m the Pi for Wheel 35. e 4-4 of Figure 3. stud bolt being screwed into the bottom 9 of the 4'0 In general. my invention contemplates theprofilter cfisihge a 3 0f he wh el 35 are 40 vision of a trough communicating with the filter Spaced 5 adjacent e bottom of the filter bottom. A conveyor means su h as' conyeying and are adapted to act as wiper blades to scrape screw is housed in th tr h, Means are proor move the sludge along the bottom of the filter vided for operating the conveyor screw and means o the trough Pawl is eed into Genare also provided for directing the sludge into the tact with the toothed P p y 34 0f t e wheel 45 trough. 1 35 by means of spring 39. ascan readily be seen More particularly referring now to the drawing, by reierehee to u e a filter casing I 'is provided with a cover member Within the filter s I p de aurth 2 which is secured thereto in pressure tight relabearing 60 for the shaft M of Wheel 42 which is tion by means of securing screws 3. Liquid to be adapte QD against the upper p p e y of 50 filtered enters the filter casing I through inlet the Wheel 35. n the region e DE a pipe 5 and passes to the-interior of the casing 3|. As will be more fully explained hereinafter, in which are positioned hollow filtering leaves 5, the wheel 42 takes the thrust of the driving acacross which are stretched filtering screens 6; tion of pawl 3| and prevents it from'being trans- The interior of the filtering leaves communicate mitted to the Pivot Stud terior surfaces of the filter screen 6 or may drop to the bottom of the filter if of such a nature as not to adhere to the filter screens. Usually the sludge is very finely divided, viscous material. I have found-that, in an arrangement similar to that described above, it is practically impossible to continuously rotate wiping arms 36 through heavy viscous sludge. .It appears that, in response to motion, the inertia of the sludge causes it to act as if it were a solid. If, however, a slight motion is given to the wiping armsand an interval of time allowed to permit fiow to take place, the wiping arms may be rotated without difficulty. In other words, an intermittent motion of slight angularity of the wiping arms is practically impossible.

possible, if a period of "rest" is allowed to permit the sludge to flow while a continuous movement which allows no period of fiow for the sludge is Ifit were attempted to continuously rotate wiping arms, a mechanical advantage would be necessary. volved would be so large as to make the equipment cumbersome and impractical.

When it is desired to clean the filter of sludge, the crank I1 is rotated. This rotates shaft l and actuates conveyor screw IE to move such sludge as is in the trough toward the removal duct 18. The cover i9 of theremoval duct I8 is removed and the receptacle placed thereunder. Rotationof the shaft I! also actuates cam 23.

Referring now to Figure 4, it will be observed that movement of the link 26 around its pivot so that the upper portion of the link travels to the left will move pawl 3| into engagement with the adjacent path to the left. During this movement, pawl 30 holds the wheel 35 against movement. As the shaft continues to rotate, the cam 23 will move the upper end of the link to the right, causing pawl 31 to drive the wheel through the amplitude of one tooth. This slight motion is easily performed. During the return of the pawl 31, a period of rest is permitted, allowing the sludge to yield against the deformation produced by the rotation of the wiper arms 36 which are carried by the wheel 35. It will be The stresses inseen that pawl 3| is the driving pawl and pawl 30 is a retaining pawl. The arms 36 willmove the sludge into the trough H from which it is removed by thelconveyor l6 and passed into the receptacle placed under the opening of branch duct l8.

It will be seen that I have accomplished the objects of my invention. -1 have provided a filter construction having incorporated therewith means for removing sludge from the bottom thereof in a simple and expeditious manner. The filter need not be disassembled in order to clean it. The tedious and unpleasant task-of cleaning filters of the type described is rendered expedient and easy. The time required is considerably reduced.

It will be understood that certain features and sub-combinations are of utility and may be employed without reference to other features and sub-combinations. This is contemplated by .and is within the scope 01'- my claims. It is further obvious that various changes may be made in details within the scope of my claims without departing from the spirit of my invention. It is, therefore, to be understood that my invention is not to be limited to the specific details shown and described.

Having thus described my invention, what I claim is:

l. A filter comprising in combination a casing,

' a hollow filtering member within said casing,

means for introducing the liquid to be filtered into said casing, means for withdrawing filtrate from the interior of said filter member, said casing having a bottom provided with an opening, a duct communicating with said opening, a conveyor screw within said duct, wiping means for said filter bottom adapted to transfer sludge into said said casing, means for withdrawing filtrate from the interior of said filter member, said casing having abottom provided with an opening, a duct communicating with said opening, a conveyor screw within said duct, wiping means for said filter bottom adapted to transfer sludge into said duct, means for rotating said conveyor screw and means operated by the rotation of said screw for intermittently operating said wiping means.

VICTOR C. NORQUIST; 

